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https://issues.apache.org/jira/browse/HDFS-14546?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17011365#comment-17011365
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Wei-Chiu Chuang edited comment on HDFS-14546 at 1/9/20 3:18 AM:
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No... AvailableSpaceVolumeChoosingPolicy is for choosing volume on a datanode
but AvailableSpaceBlockPlacementPolicy is for selecting the datanode of a block.
AvailableSpaceBlockPlacementPolicy is quite popular among my users and so I
would really like to see it documented.
was (Author: jojochuang):
No... AvailableSpaceVolumeChoosingPolicy is for choosing volume on a datanode
but AvailableSpaceBlockPlacementPolicy is for selecting the datanode of a block.
> Document block placement policies
> ---------------------------------
>
> Key: HDFS-14546
> URL: https://issues.apache.org/jira/browse/HDFS-14546
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Íñigo Goiri
> Assignee: Amithsha
> Priority: Major
> Labels: documentation
> Attachments: HDFS-14546-01.patch, HDFS-14546-02.patch,
> HDFS-14546-03.patch, HDFS-14546-04.patch, HDFS-14546-05.patch,
> HDFS-14546-06.patch, HDFS-14546-07.patch, HDFS-14546-08.patch,
> HdfsDesign.patch
>
>
> Currently, all the documentation refers to the default block placement policy.
> However, over time there have been new policies:
> * BlockPlacementPolicyRackFaultTolerant (HDFS-7891)
> * BlockPlacementPolicyWithNodeGroup (HDFS-3601)
> * BlockPlacementPolicyWithUpgradeDomain (HDFS-9006)
> We should update the documentation to refer to them explaining their
> particularities and probably how to setup each one of them.
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